<template>
	<view>
		<view class="search-box">
			<uni-search-bar :radius="100" :focus="true" @input="input" cancelButton="none"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view @click="gotoDetail(item)" class="sugg-item" v-for="(item, i) in searchResults" :key="i">
				<view class="goods-name">
					{{item.goods_name}}
				</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" type="error" v-for="(item, i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
	
</template>

<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				// 搜索结果列表
				searchResults: [],
				// 搜索关键词的历史记录
				historyList: []
			};
		},
		onLoad() {
			this.historyList= JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		computed: {
			historys() {
				return [...this.historyList].reverse()
			}
		},
		methods: {
			input(e) {
				clearTimeout(this.timer)
				this.timer= setTimeout(()=>{
					this.kw= e
					this.getSearchList()
				},500)
				
			},
			async getSearchList() {
				//判断关键词是否为空
				if(this.kw.trim() === '') {
					this.searchResults = []
					return
				}
				const {data:res}= await uni.$http.get('/api/public/v1/goods/qsearch', { query: this.kw })
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				
				//  查询到搜索建议之后，调用 saveSearchHistory() 方法保存搜索关键词
				this.saveSearchHistory()
			},
			gotoDetail(item) {
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
				})
			},
			saveSearchHistory() {
			  // 1. 将 Array 数组转化为 Set 对象
				const set = new Set(this.historyList)
				// 2. 调用 Set 对象的 delete 方法，移除对应的元素
				set.delete(this.kw)
				// 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
				set.add(this.kw)
				// 4. 将 Set 对象转化为 Array 数组
				// this.historyList = Array.from(set)
				this.historyList = ([...set])
				
				// 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
				//数组去重
				// let arr= []
				// arr.unshift(this.kw)
				// arr.forEach((item,i)=>{
				// 	if(this.historyList.indexOf(item)=== -1){
				// 		this.historyList.unshift(item)
				// 	}
				// })
			},
			cleanHistory() {
				this.historyList= []
				uni.removeStorageSync('kw')
			},
			gotoGoodsList(kw) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		}
	}
</script>

<style lang="scss">
.search-box {
	position: static;
	top: 0;
	z-index: 999;
}
.sugg-list {
	padding: 0 5px;
	.sugg-item {
		font-size: 12px;
		padding: 13px 0;
		display: flex;
		align-items: center;
		justify-content: space-between;
		 border-bottom: 1px solid #efefef;
		.goods-name {
			white-space: nowrap;
			overflow: hidden;
			text-overflow: ellipsis;
			margin-right: 3px;
		}
	}
}
.history-box {
  padding: 0 5px;

  .history-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 40px;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }

  .history-list {
    display: flex;
    flex-wrap: wrap;
		margin-top: 5px;
    .uni-tag {
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
